Method for manufacturing the body of a safety shoe

ABSTRACT

A method for manufacturing the body of a shaft shoe; it is characterized in that: before the body of safety shoe is molded, multi-layered cloth obtained by wearing glass fibers, or carbon fibers, or the mixed fibers of glass fibers and carbon fibers in a plurality of directions is coated with epoxy resins onto its two surfaces, and then, said cloth is put between the outer and inner layers of leather. It is preferably to be put at an enforced portion, such as the head portion of a shoe. Then the molded shoe is light in weight, excellent in strength and can be quickly molded.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a method for manufacturing the body of a safety shoe, especially to a method for manufacturing the body of a safety shoe, which is able to naturally mold the body of a safety shoe; then the manufacturing cost is lowered and the safety shoe comprises high strength of anti-pressure and impact force.

[0003] 2. Description of the Prior Art

[0004] In order to completely protect toes and the bottom of foot would not be hurt by exterior elements. For example, when one person is walking or doing the work of lifting heavy goods, the foot would be prevented from hurt even the heavy good drops down to hit the foot, and the bottom of foot would be prevented from being hurt by nails or other sharp objects. This is why the safety shoe is invented.

[0005] As shown in FIG. 1, the body of a conventional safety shoe includes a medium layer 13 put between the outer leather 12 and the inner leather layer 11. The medium layer 13 is mostly mode of a plastic material, such as PVC, Nylon . . . etc. However, the plastic materials can not endure impact force; therefore, in order to increase the ability of enduring an impact force, it is used to simply thicken the medium layer. However, this method causes a result of greatly increasing the weight and size of safety shoes, and people's actions become inconvenient. Then a further improvement was provided.

[0006] As shown in FIG. 2, the further improvement of safety shoes is to change said medium layer 13 to a steel envelop 2. That is, a steel envelope 2 is attached to the inner leather layer at the head when the shoe's body is to be molded, and then, the outer leather is pulled to the mold of the shoe to cover the steel envelope and to form the body of a safety shoe. Although a steel with thickness of 2 m/m is available to form a steel envelope which is able to endure a standard of lowest impact force, the weight of shoe would be greatly increase and it would not be comfortable to people. In addition, it causes a danger of electric strikes.

[0007] Furthermore, in manufacturing safety shoes, to prevent the bottom of safety shoes be pierced through to hurt people's foot is also very important. The general steel shoes bottoms are made of by 0.4 m/m thickness of iron or steel plate; however, neither iron plate nor steel plate would return to its original shape if it is bent. And it still has a danger of electric strikes.

[0008] Besides, it is noted to the public that in order to simplify the manufacturing processes of shoe's body, a steel envelope of one size is used in shoes having three sizes. Then the safety shoes become not comfortable to people.

[0009] In addition, in preparing said plastic medium layer, said steel envelope and said steel shoe's bottom, it is necessary to form the separate elements according to the design of shoes. For example, the plastic medium layer is formed by an extruder and the steel envelope. The steel shoe's bottom is made by a pressing machine.

[0010] In conclusion from the above, the conventional plastic medium layer, the steel envelope and the steel shoe's bottom have the following disadvantages:

[0011] 1. The cost is high. If the design of shoes has to be changed, then a new model has to be prepared.

[0012] 2. The manufacturing processes of shoes would be limited by the molds and can not be improved.

[0013] 3. The molding process has to be operated in two steps; it would reduce the production quantity.

[0014] Since said conventional articles have the above-mentioned disadvantages, the inventor then develop the present invention to improve disadvantages happened in conventional articles.

SUMMARY OF THE INVENTION

[0015] The main object of the present invention is to provide a method for manufacturing the body of a safety shoe. According to the method for manufacturing the body of a safety shoe, before the body of safety shoe is molded, a multi-layered cloth obtained by wearing glass fibers, or carbon fibers, or the mixed fibers of glass fibers and carbon fibers in multi-directions is coated with epoxy resins onto its two surfaces, and then said cloth is put between the outer and inner layers of leather. Thus the obtained leathers including a medium layer is available to form the body of a safety shoe by a molding process.

[0016] According to the method for manufacturing the body of a safety shoe of present invention, since the protection layer of multi-layered cloth is coated with epoxy resins onto its two surfaces, and then is put between the outer layer of leather and inner layer of leather, then it is not necessary to prepare a mold for protection layer. The manufacturing cost then would be greatly reduced; this is another object of present invention.

[0017] According to the method for manufacturing the body of a safety shoe of present invention, since the protection layer of multi-layered cloth is coated with epoxy resins onto its two surfaces, and then is put between the outer layer of leather and inner layer of leather, then it would be easily to match with the last of shoe and can be used for manufacturing the bodies shoes suitable for people's feet of different sizes; this is also another object of present invention.

[0018] According to the method for manufacturing the body of a safety shoe of present invention, since the protection layer of multi-layered cloth is coated with epoxy resins onto its two surfaces, and then is put between the outer layer of leather and inner layer of leather, then only one operation is enough for the molding step of forming the body of safety shoes and the production quality then can be greatly improved; this is also another object of present invention.

[0019] According to the method for manufacturing the body of a safety shoe of present invention, since the protection layer of multi-layered cloth is coated with epoxy resins onto its two surfaces, and then is put between the outer layer of leather and inner layer of leather, then the weight of the body of safety shoes would be greatly decreased, and the comfort of feet would be increased; this is also another object of present invention.

[0020] According to the method for manufacturing the body of a safety shoe of present invention, since the protection layer of multi-layered cloth is coated with epoxy resins onto its two surfaces, and then is put between the outer layer of leather and inner layer of leather, it would recover quickly after the bending force is removed, and then the head and bottom of the shoe's body would not be distorted.

[0021] According to the method for manufacturing the body of a safety shoe of present invention, since the protection layer of multi-layered cloth is coated with epoxy resins onto its two surfaces, and then is put between the outer layer of leather and inner layer of leather, since it is an insulator and can not be conducted by electricity, then its safety would become higher than conventional ones, this is also another object of present invention.

[0022] According to the method for manufacturing the body of a safety shoe of present invention, since the protection layer of multi-layered cloth is coated with epoxy resins onto its two surfaces, and then is put between the outer layer of leather and inner layer of leather, then the strength of safety shoes can be maintained; this is also another object of present invention.

[0023] According to the method for manufacturing the body of a safety shoe of present invention, it can be applied to every kind of safety shoes such as: engineering shoes, miner shoes, mountain shoes, waterproof shoes, military shoes, working shoes; this is also another object of present invention.

[0024] The present invention will be better understood and its numerous objects and advantages will become apparent to those skilled in the art by referencing to the following drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0025]FIG. 1 shows the body of a conventional safety shoes having partially cross-sectioned;

[0026]FIG. 2 shows the body of another conventional safety shoes having steel envelope at it head portion;

[0027]FIG. 3 shows the step 1 of the method for manufacturing the body of a safety shoe of present invention;

[0028]FIG. 4 shows the step 2 of the method for manufacturing the body of a safety shoe of present invention;

[0029]FIG. 5 shows the step 3 of the method for manufacturing the body of a safety shoe of present invention;

[0030]FIG. 6 shows the step 4 of the method for manufacturing the body of a safety shoe of present invention;

[0031]FIG. 7 shows the step 5 of the method for manufacturing the body of a safety shoe of present invention;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0032] According to the method for man manufacturing the body of a safety shoe of present invention, before the body of safety shoe is molded, a multi-layered cloth 32 (as shown in FIG. 4) has to be prepared firstly by wearing glass fibers 31 (as known in FIG. 3) in a plurality of directions. Then, each of the inner and outer surfaces of the cloth is coated with epoxy resin 33 to form protection layer 34 (as shown in FIG. 5). After that, said protection layer 34 is put between the outer and inner layers of leather 36, 35 and sewed to form a body layer 37 (as shown in FIG. 6); before the body layer 37 is put onto a last, the body layer 37 is cut to meet the size and outline of the last 41, then the obtained body layer is climbed and firmly attached onto the pre-determined reinforced portion (for example, the heat of a shoe). And finally, the body layer 37 is formed by a general process of manufacturing a shoe (as shown in FIG. 7).

[0033] By the said method of manufacturing the body of a safety shoe, the body of safety shoe would be obtained by one process, and the body of safety shoe would be obtained to meet with the size of the last for molding. Furthermore, the body of safety shoe would be obtained by using the general manufacturing processes.

[0034] Said glass fiber 31 can be replaced by carbon fibers or the mixed fibers of glass fibers and carbon fibers.

[0035] Or, said cloth 32 can also be covered within a cloth bag coated with latex to form a body and then climbs it onto the shoe last such as to form the body of a safety shoe.

[0036] According to the method for manufacturing the body of a safety shoe, the protection layer 34 inside the medium portion of a body can be adjusted by different standards of endurance to impact forces as follows:

[0037] 1. The protection layer can be a cloth obtained by wearing 100% of glass fibers, and both of its two surfaces are coated with epoxy resins.

[0038] 2. The protection layer can be a cloth obtained by wearing 70% of glass fibers and 30% of carbon fibers, and both of its two surfaces are coated with epoxy resins.

[0039] 3. The protection layer can be a cloth obtained by wearing 50% of glass fibers and 50% of carbon fibers, and both of its two surfaces are coated with epoxy resins. Then the obtained body of safety shoe would meet the standard of impact force endurance as to the safety shoe having a steel envelope at its head portion.

[0040] 4. The protection layer can be a cloth obtained by wearing 100% of carbon fibers, and both of its two surfaces are coated with epoxy resins. Then the obtained body of safety shoe would meet the standard of impact force endurance as to the safety shoe having a steel envelope at its head portion.

[0041] Furthermore, according to the method for manufacturing the body of a safety show, the protection layer at the bottom portion of the body can be:

[0042] 1. A cloth obtained by wearing 100% of glass fibers.

[0043] 2. A cloth obtained by wearing 100% of carbon fibers.

[0044] According to the method for manufacturing the body of a safety shoe of present invention, it can be applied to every kind of safety shoes such as: engineering shoes, miner shoes, mountain shoes, waterproof shoes, military shoes, working shoes . . . etc.

[0045] In comparison with the structure of a safety shoe obtained by the present invention and the conventional safety shoe, the former one has the following advantages:

[0046] 1. The protection layer is inserted between the outer and inner layer of leather before the molding process is performed, then it is not necessary to have the molds for preparing the protection layer. Not only the costs of molds would be saved, but also the method of present invention is available to manufacturing every kind of safety shoes. The business would then be expanded.

[0047] 2. The manufacturing method does not need two operations, the production quantity would be increased to 30%.

[0048] 3. The weight of safety shoe would be reduced to 20% of conventional ones; it is comfortable to people's feet.

[0049] 4. The outer shape of the safety shoe manufactured by the present invention would be maintained.

[0050] 5. The protection layer is made by insulation material; it is then can not be conducted by electricity and is much safer than conventional safety shoes.

[0051] In conclusion from the above, it can be clearly seen that the method for manufacturing the body of a safety shoe uses a multi-layered cloth obtained by wearing glass fibers, or carbon fibers, or the mixed fibers of glass fibers and carbon fibers in a plurality of directions before the body of safety shoe is molded, and the cloth is put between the outer and inner layer of leather after its two surfaces are coated with epoxy. resins. Then it would effectively obtain the body of a safety shoe which has high strength, light weight and can be quickly molded without the provision of molds; then the manufacturing cost would be greatly reduced, the bodies of safety shoes with different designs and suitable for people's feet of different sizes can be obtained. Besides, only one operation is enough for the molding step of forming the body of safety shoes. The production quantity would be greatly improved, and the comfort of feet and safety would be increased. It then would improve the disadvantages of conventional safety shoes, and since it does not have opened to the public, it then complies conditions of approvable patent.

[0052] Although the present invention has been described using a specified embodiment, the examples are meant to be illustrative and not restrictive. It is clear that many other variations would be possible without departing from the basic approach, demonstrated in the present invention. 

What is claimed is:
 1. A method for manufacturing the body of a safety shoe, comprising the steps of: before the body of safety shoe is molded, preparing a multi-layered cloth by wearing glass fibers in a plurality of directions; coating the inner and outer surfaces of said cloth with epoxy resins to form protection layer; putting said protection layer between the outer and inner layers of leather and sewing it to form a body layer; cutting said body layer to meet with the size and outline of the last; climbing and firmly attaching said body layer onto the predetermined reinforce portion of a last; and molding the body layer on a last to form the body of a safety shoe.
 2. The method for manufacturing the body of a safety shoe as claimed in claim 1, wherein said multi-layered cloth is obtained by wearing carbon fibers in a plurality of directions.
 3. The method for manufacturing the body of a safety shoe as claimed in claim 1, wherein said multi-layered cloth is obtained by wearing mixed fibers of glass fibers and carbon fibers in a plurality of direction.
 4. The method for manufacturing the body of a safety shoe as claimed in claim 1, wherein said protection layer is a cloth obtained by wearing 70% of glass fibers and 30% of carbon fibers, and both its two surfaces are coated with epoxy resins.
 5. The method for manufacturing the body of a safety shoe as claimed in claim 1, wherein said protection layer is a cloth obtained by wearing 50% of glass fibers and 50% of carbon fibers, and both its two surfaces are coated with epoxy resins.
 6. The method for manufacturing the body of a safety shoe as claimed in claim 1, wherein said cloth can also be covered within a cloth bag coated with latex to form a body and then climbs it onto the shoe last such as to form the body of a safety shoe. 